Comparison of the compensation effects of fiber nonlinear impairments with mid-span optical phase conjugation between PDM CO-OFDM system and PDM QPSK system
Xu Fei, Guo Meng-Qi, Wang Lei, Qiao Yao-Jun†, , Tian Hui-Ping
       

System schematic diagram of 112-Gb/s PDM CO-OFDM.